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  <div class="section" id="case-2-one-button-mapped-to-one-led">
<span id="case-2"></span><h1>Case 2 - one button mapped to one LED<a class="headerlink" href="#case-2-one-button-mapped-to-one-led" title="Permalink to this heading">¶</a></h1>
<p>Having Thread network configured and operational, you can start KNX IoT device configuration and testing.
One device must be configured as an Actuator and one as a Sensor.</p>
<p>Perform configuration/mapping of buttons built in to KNX IoT Sensor <a class="reference external" href="https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK">nRF52840 DK</a> to control LEDs built in to the KNX IoT Actuator <a class="reference external" href="https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK">nRF52840 DK</a> - one button to one LED.
It is achieved by dedicated on KNX group to every input-output pair.</p>
<ol class="arabic">
<li><p>Configure the Actuator device by adding entries to Actuator’s Group Object Table.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">uart:~$ </span>knx<span class="w"> </span>got<span class="w"> </span>add<span class="w"> </span><span class="m">1</span><span class="w"> </span>/p/1<span class="w"> </span><span class="m">22</span><span class="w"> </span><span class="o">[</span><span class="m">1</span><span class="o">]</span>
<span class="gp">uart:~$ </span>knx<span class="w"> </span>got<span class="w"> </span>add<span class="w"> </span><span class="m">2</span><span class="w"> </span>/p/2<span class="w"> </span><span class="m">22</span><span class="w"> </span><span class="o">[</span><span class="m">2</span><span class="o">]</span>
<span class="gp">uart:~$ </span>knx<span class="w"> </span>got<span class="w"> </span>add<span class="w"> </span><span class="m">3</span><span class="w"> </span>/p/3<span class="w"> </span><span class="m">22</span><span class="w"> </span><span class="o">[</span><span class="m">3</span><span class="o">]</span>
<span class="gp">uart:~$ </span>knx<span class="w"> </span>got<span class="w"> </span>add<span class="w"> </span><span class="m">4</span><span class="w"> </span>/p/4<span class="w"> </span><span class="m">22</span><span class="w"> </span><span class="o">[</span><span class="m">4</span><span class="o">]</span>
</pre></div>
</div>
</li>
<li><p>Set device installation identifier and device individual address for Actuator device.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">uart:~$ </span>knx<span class="w"> </span>dev<span class="w"> </span>iid<span class="w"> </span><span class="m">1</span>
<span class="gp">uart:~$ </span>knx<span class="w"> </span>dev<span class="w"> </span>ia<span class="w"> </span><span class="m">1</span>
</pre></div>
</div>
</li>
<li><p>Configure the Sensor device by adding entries to Sensor’s Group Object Table.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">uart:~$ </span>knx<span class="w"> </span>got<span class="w"> </span>add<span class="w"> </span><span class="m">1</span><span class="w"> </span>/p/1<span class="w"> </span><span class="m">22</span><span class="w"> </span><span class="o">[</span><span class="m">1</span><span class="o">]</span>
<span class="gp">uart:~$ </span>knx<span class="w"> </span>got<span class="w"> </span>add<span class="w"> </span><span class="m">2</span><span class="w"> </span>/p/2<span class="w"> </span><span class="m">22</span><span class="w"> </span><span class="o">[</span><span class="m">2</span><span class="o">]</span>
<span class="gp">uart:~$ </span>knx<span class="w"> </span>got<span class="w"> </span>add<span class="w"> </span><span class="m">3</span><span class="w"> </span>/p/3<span class="w"> </span><span class="m">22</span><span class="w"> </span><span class="o">[</span><span class="m">3</span><span class="o">]</span>
<span class="gp">uart:~$ </span>knx<span class="w"> </span>got<span class="w"> </span>add<span class="w"> </span><span class="m">4</span><span class="w"> </span>/p/4<span class="w"> </span><span class="m">22</span><span class="w"> </span><span class="o">[</span><span class="m">4</span><span class="o">]</span>
</pre></div>
</div>
</li>
<li><p>Set device installation identifier and device individual address for Sensor device.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">uart:~$ </span>knx<span class="w"> </span>dev<span class="w"> </span>iid<span class="w"> </span><span class="m">1</span>
<span class="gp">uart:~$ </span>knx<span class="w"> </span>dev<span class="w"> </span>ia<span class="w"> </span><span class="m">2</span>
</pre></div>
</div>
</li>
<li><p>Devices are configured.
Use one of the sensor’s buttons to control one of the assigned actuator’s LEDs.
The interconnections between buttons and LEDs are presented in the following table:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 50%" />
<col style="width: 50%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Control button
(Sensor)</p></th>
<th class="head"><p>Controlled LED
(Actuator)</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>BUTTON1</p></td>
<td><p>LED1</p></td>
</tr>
<tr class="row-odd"><td><p>BUTTON2</p></td>
<td><p>LED2</p></td>
</tr>
<tr class="row-even"><td><p>BUTTON3</p></td>
<td><p>LED3</p></td>
</tr>
<tr class="row-odd"><td><p>BUTTON4</p></td>
<td><p>LED4</p></td>
</tr>
</tbody>
</table>
</li>
</ol>
</div>


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